Spectra Precision Survey Pro v5.4 - Manual (Page 47)

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• BS Point [2]: Backsight point. The station location will be set from the
coordinates of the known point. The backsight circle orientation will also
be set to 0°00’00” in that case.
• New Point [3]: This is a variant of backsight azimuth in which the azimuth
is given to a new point you would like to measure and add to the job.
The diagram below illustrates the three possible scenarios.
NOTE: A variant to this procedure exists (whatever the scenario used) if the Survey with
True Azimuths setting is enabled (see Job > Settings > Surveying tab). In this case, the
backsight circle will always be set automatically to the true azimuth, either the entered
one (
BS Azimuth then renamed “True Azimuth” scenario and New Point scenario) or the
calculated one ( BS Point scenario).
The three scenarios are detailed below with the Survey with True Azimuths option
disabled.
Start the station setup as follows:
• Go to the Main Menu, then tap Survey > Station Setup.
• Choose Setup Type= Known Point.
• Enter the name of the station setup point in the Occupy Point field. The
point name can be entered directly, or, picked from the map or point list
using the
button.
• If you wish to ignore elevations in your job, check the 2D Survey box. You
will otherwise enter the height of instrument in the HI field.
• Tap Next.
Then, of the three possible options, choose the one that is suitable for your job:
1. If you choose BS Azimuth:
• Aim the instrument in the direction of a known or assumed azimuth.
[2]
Known Backsight Point
Known Station Point
[3]
New Backsight Point
Known Station Point
[1]
Known Station Point
Known Azimuth Direction